Comparison of
properties of Austenitic stainless steel |
Specification |
18%Cr-8%Ni,
25%Cr-20%Ni Stainless Steel |
TP304H |
TP347H
|
|
|
|
Standard |
PED |
－ |
－ |
VdTÜV547 |
VdTÜV550 |
VdTÜV546
|
ASME |
SA213
TP304L |
SA213
TP347H |
Sec.
I
Case 2159-1 |
Sec.
I
Case 2328-1 |
Sec.
I
Case 2115-1 |
Chemical
composition |
18Cr-8Ni |
18Cr-11Ni-0.9Nb |
18Cr-9Ni-3Cu-Nb
|
25Cr-20Ni-Nb-N
|
|
550°C |
92 |
112 |
121 |
128 |
134 |
600°C |
64 |
91 |
108 |
121 |
124 |
650°C |
42 |
54 |
66 |
78 |
76 |
YS
min. (MPa)
TS min. (MPa)
|
205
515
|
205
515
|
205
550
|
235
590
|
295
655
|
Graing
Size |
5.4 |
6.0 |
8.7 |
8.5 |
4.5 |
Thickness
of steam
oxidation scale
(650°Cx1000hr)
|
35µm
(Total layer) |
27µm
(Total layer) |
|
|
|
Coal
ash corrosion**
(650°Cx20hr, mg/cm2)
|
45 |
28 |
28 |
35 |
12 |
Welding
material |
GTAW |
OK |
OK |
OK |
OK |
OK |
SMAW |
OK |
OK |
OK |
OK |
OK |
|
|
| Note: ( * Calculated
value according to ASME) (** Gas:1%SO2-5%O2-15%CO2-Bal
N2, Ash:1.5MNa2SO4-1.5Mk2SO4-1MFe2O3) |
|
TP347HFG
(18Cr-10Ni-0.8Nb) |
Structure: Fine-grained,
ASTM Grain Size Number 7 or Finer
Strength: Higher than
TP304H and TP347H
Steam Oxidation Resistance : Superior
to conventional 18Cr-8Ni steels
Designation: ASTM, ASME, PED, Japanese METI
Shot Peening: Applicable
Shipping Record: 5700 ton (Japan, Poland, Denmark,
China, Korea)
|
|
SUPER304H
(18Cr-9Ni-3Cu-Nb-N) |
Strength: 20%
higher than TP347H (The highest among 18Cr
steels)
Designation: ASTM, ASME, PED, Japanese METI
Shot Peening: Applicable
Shipping Record: 8700 ton (Japan, Korea, Thailand, U.S.A.,
China, India, Australia) |
|
HR3C (25Cr-20Ni-0.4Nb-0.2N) |
Strength: 20-30%
higher than TP347H
Corrosion Resistance: Same
as TP310H under coal-fired boiler condition
Designation: ASTM, ASME,
PED, Japanese METI
Shipping Record: 5000
ton (Japan, U.S.A., England, China,
Mexico)
ASME allowable tensile stresses of austenitic
stainless steel tubes
|
Comparison of steam oxidation
scale after service exposure in an actual boiler
|
 |
High temperature corrosion resistance
|
|
|
a) Steam
oxidation properties (650°C,500h) |
b) Hot
corrosion in synthetic coal ash (650°C,20h) |
| |
